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| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2010-05-15 18:53:35 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-08-01 10:35:50 +0300 |
| commit | f78978aa3a8222f7822f15fba5dbaea990ef0887 (patch) | |
| tree | b961f86576c2bfd58d546c44efa193bc9db449c6 /arch/x86/kvm/paging_tmpl.h | |
| parent | e02aa901b1aa41fb541521800cc2a4774c162485 (diff) | |
| download | lwn-f78978aa3a8222f7822f15fba5dbaea990ef0887.tar.gz lwn-f78978aa3a8222f7822f15fba5dbaea990ef0887.zip | |
KVM: MMU: only update unsync page in invlpg path
Only unsync pages need updated at invlpg time since other shadow
pages are write-protected
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 22f13797f521..0671d7a29c3c 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -461,6 +461,7 @@ out_unlock: static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) { struct kvm_shadow_walk_iterator iterator; + struct kvm_mmu_page *sp; gpa_t pte_gpa = -1; int level; u64 *sptep; @@ -472,10 +473,13 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) level = iterator.level; sptep = iterator.sptep; + sp = page_header(__pa(sptep)); if (is_last_spte(*sptep, level)) { - struct kvm_mmu_page *sp = page_header(__pa(sptep)); int offset, shift; + if (!sp->unsync) + break; + shift = PAGE_SHIFT - (PT_LEVEL_BITS - PT64_LEVEL_BITS) * level; offset = sp->role.quadrant << shift; @@ -493,7 +497,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) break; } - if (!is_shadow_present_pte(*sptep)) + if (!is_shadow_present_pte(*sptep) || !sp->unsync_children) break; } |